Answer:
False. This is because ellipses have 2 focus points and not only one.
What is an accurate description of what occurs when a log burns
Answer:
a. energy is created as the log burns b. the compounds that make up the log are converted into fire, heat, and energy. c. as the log burns, the nuclear binding energy of the molecules in the log is released. the nuclear binding energy is transformed into the light and heat of the fire. d. the molecules present in the log are transformed into molecules that contain less energy than the original molecules. the energy difference is the heat of the fire?Explanation:
CAN YOU PLS CHECK IF ITS CORRECT I'LL MARK YOU BRAINLIST
i think it looks good
yea it correct
BTW yw if it's right
Answer:
-4000
Explanation:
jptjpdjsjsjsfbsjjdbabdjzjwjdjadjzjejxjaA
Describe what happens when there is no Friction and you stop pushing on an object?
I will give Brainliest to the first person :)
Answer: See below
Explanation: Considering no friction it will continue to slide until an outside force acts upon it such as hitting something or falling off something.
The input work on pulley system is 75J. If the pulley system is 84 percent efficient, then what is the output work from the pulley system?
Answer: 63 J
Explanation: The effiency () of a machine is given by the ratio between the output work and the input work :
Where:
Isolating :
Finally:
Câu 5. Một vật dao động điều hòa với phương trình x = 20cos(10pit +pi/2) (cm). Xác định thời điểm đầu tiên vật đi qua vị trí có li độ x = 5 cm theo chiều âm kể từ thời điểm t = 0.
Answer:
Explanation:lớp 12 à
is sliding or static friction greater in magnitude?
Answer: static friction
Explanation:
During sliding, contact points do not get enough time to get interlocked properly. Therefore, less friction. But, when the object is at rest, the surfaces interlock well, therefore friction is more. This explains why sliding friction is less than static friction.
Everyday examples of buoyancy force
Answer: A person with a life vest floating on water, Ship floating on the ocean, Helium balloon rising in the air, etc.
Explanation: Cause I said so uwu
if a car is accelerating downhill under a net force of 3674 N, what additional force would cause the car to have a constant velocity?
Hi there!
For an object to have a constant velocity, the SUM of the forces must equal 0. This means that the forces are balanced.
When a car is accelerating downhill, it is experiencing a force due to gravity of F = MgsinФ.
In order to balance the forces, there must be an equal and OPPOSITE force acting on the object. This would be a force of kinetic friction.
Thus:
∑F = -F (Kinetic Friction) + MgsinФ
0 = -F (Kinetic Friction) + MgsinФ
MgsinФ = F (Kinetic Friction)
Thus, the force of Kinetic Friction = -3674 N
(Negative indicates in the opposite direction)
two pendula are released from rest at the same height h above their lowest points. how do the maximum velocities of the two pendulums compare? note that pendulum 2 has a string with length twice that of pendulum 1.
The simple pendulum concept and rotational kinematics relationships allow finding the result for the velocity relationship
The shortest pendulum (w₁) has more speed than the longest pendulum (w₂)w₁ = [tex]\sqrt{2}[/tex] w₂
The simple harmonic movement is a periodic movement where the restoring force is proportional to the elongation, in the case of the simple pendulum it is fulfilled for angles less than 10º. The expression for motion is
θ = θ₀ cos ωt
ω² = g / l
the angular velocity is defined by
w = [tex]\frac{d \theta}{dt}[/tex]
w = - θ₀ ω sin ωt
Where θ₀ is the initial angle or amplitude, w is the angular velocity, t the time, g the acceleration of gravity and l the length of the pendulum
Let's find the angular velocity for each pendulum
ω ₁ = [tex]\sqrt{ \frac{g}{l_1} }[/tex]
Indicate that the second pendulum length is
l₂ = 2 l₁
ω₂ = [tex]\sqrt{\frac{g}{2l_1} }[/tex]
the pendulum speed is maximum at the lowest point of the trajectory that occurs when the sine function has its maximum value
w = θ₀ω
Suppose that the two pendulums are released with the same initial angle
Pendulum 1
w₁ = θ₀ [tex]\sqrt{\frac{g}{l_1} }[/tex]
Pendulum 2
w₂ = θ₀ [tex]\sqrt{\frac{g}{2l_1} }[/tex]
We look for the relationship between the two speeds
[tex]\frac{w_1}{w_2} = \sqrt{2}[/tex]
In conclusion, using the simple pendulum concept and the rotational kinematics relations we can find the result for the velocity relation
The shortest pendulum (w₁) has more speed than the longest pendulum (w₂)
w₁ = √2 w₂
Learn more here: brainly.com/question/24159297
When you stand on the floor, the force of your body pushing down on the floor is
A. Matched by the floor pushing up on your body.
B. Less than the reaction force applied by the floor.
C. A reaction to the floor pushing up.
D. None of the above.
Answer:
D. None of the above
2.) Explain why the starting angle doesnt impact the time it takes the pendulum to swing back and forth?
The starting angle θθ of a pendulum does not affect its period for θ<<1θ<<1. At higher angles, however, the period TT increases with increasing θθ.
The relation between TT and θθ can be derived by solving the equation of motion of the simple pendulum (from F=ma)
−gsinθ=lθ¨−gainθ=lθ¨
For small angles, θ≪1,θ≪1, and hence sinθ≈θsinθ≈θ. Hence,
θ¨=−glθθ¨=−glθ
This second-order differential equation can be solved to get θ=θ0cos(ωt),ω=gl−−√θ=θ0cos(ωt),ω=gl. The period is thus T=2πω=2πlg−−√T=2πω=2πlg, which is independent of the starting angle θ0θ0.
For large angles, however, the above derivation is invalid. Without going into the derivation, the general expression of the period is T=2πlg−−√(1+θ2016+...)T=2πlg(1+θ0216+...). At large angles, the θ2016θ0216 term starts to grow big and cause
A 4.50 kg block is suspended from the end of a light vertical rope. A time-dependent force is applied to the upper end of the rope, and the box moves upward with a velocity magnitude that varies in time according to v(t)=(2.00m/s2)t+(0.600m/s3)t2.
What is the tension of the rope when the velocity of the box is 8.00 m/s?
Answer:
Answer:
T = 74.3N
Explanation:
We are given;
v(t) = (2.00m/s²)t+(0.600m/s³)t²
So, when v = 9 m/s;
9 = 2t + 0.6t²
0.6t² + 2t - 9 = 0
Solving this quadratic equation,
t = -5.88 or 2.55
We'll pick t = 2.55 s
Now, kinematic acceleration will be the derivative of the acceleration.
Thus, a = dv/dt = 2 + 1.2t
So, acceleration at that time t = 2.55s is; a = 2 + 1.2(2.55) = 5.06 m/s²
Since the rope is subject to both acceleration and gravity, Tension is;
T = mg + ma
T = m(g + a)
T = 5(9.8 + 5.06)
T = 74.3N
Explanation:
define centripetal force
Answer:
Centripetal force is a force that acts on a body moving ion a circular path and is directed toward the center around which the body is moving.
Quan sát sóng dừng trên sợi dây dài 60cm cố định hai đầu, thấy có 3 nút (bao gồm cả hai
nút hai đầu) và 2 bụng. Bước sóng của sóng lan truyền trên sợi dây là:
A. 30cm. B. 40cm. C. 20cm. D. 60cm.
Answer:
Quan sát sóng dừng trên sợi dây dài 60cm cố định hai đầu, thấy có 3 nút (bao gồm cả hai
nút hai đầu) và 2 bụng. Bước sóng của sóng lan truyền trên sợi dây là:
a car takes off from rest and covers a distance of 80m on a straight road in 10s.calculate the magnitude of its acceleration
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Here's the solution :
Let's find the final velocity :
[tex] \dfrac{displacement}{time} [/tex][tex] \dfrac{80}{10} [/tex][tex]8 \: \: ms {}^{ - 1} [/tex]Initial velocity (u) = 0 (cuz it started from rest)
Final velocity (v) = 8 m/s
Time taken (t) = 10 sec
now, we know that :
[tex]acceleration = \dfrac{v - u}{t} [/tex][tex] \dfrac{8 - 0}{10} [/tex][tex] \dfrac{8}{10} [/tex][tex]0.8 \: \: m {s}^{ - 2} [/tex]Acceleration = 0.8 m/s²
In a ……………………………….. wave, the particles of the medium vibrate in a direction parallel
to the direction which the wave moves.
1. Energy
2. Medium
3.Transverse
4.Longitudinal
Answer:
4 longitudinal waves
Explanation:
have a beautiful day ahead
An object is placed 10 cm in front of a concave lens. If the image formed at a distance of 5 cm from concave lens, calculate the focal length of the lens?
Answer:
I would be 5 centimeters I think
which has greater value, a newton of gold on earth or a newton of gold on the moon?
One newton of gold on the moon would have a greater value than a newton of gold on earth because the magnitude of the acceleration due to gravity on the moon is smaller than the gravity on the earth .
What is gravity ?It can be defined as the force by which a body attracts another body toward its center as the result of the gravitational pull of one body and another .
As given in the problem, we have to find out which has greater value, a newton of gold on earth or a newton of gold on the moon .
A newton of gold would be worth more on the moon than it would be on earth since the moon experiences a smaller acceleration from gravity than the earth does .
To learn more about gravity here , refer to the link given below ;
brainly.com/question/4014727
#SPJ5
what evidence is there that sound Travels through gases
Answer:
solid
Explanation:
because the molecule of solid is farest than gas
Which is a vector? Displacement Distance Speed None
Answer:
A vector is an object that has both a magnitude and a direction. Geometrically, we can picture a vector as a directed line segment, whose length is the magnitude of the vector and with an arrow indicating the direction.
Explanation:
brainliest plz
Answer:
The correct answer is
Displacement.
As Displacement has both magnitude and direction it is Vector.
Hope it helps.
Plz mark me brainest
which of these traits is NOT found in invertebrates
a. antennae
b. eyes
c. endoskeleton
d. none of them
Answer:
D) None of the Above
I hope this is correct; Let me know if it is in the comments.
A wooden log has to be carried by two people. If one of them is strong and another weak, how will they carry the log? Show with a diagram and also give reason.
Answer:
Unbalanced forces
When two forces acting on an object are not equal in size, we say that they are unbalanced forces. The overall force acting on the object is called the resultant force. If the forces are balanced, the resultant force is zero.
If the forces on an object are unbalanced, this is what happens:
a stationary object starts to move in the direction of the resultant force
a moving object changes speed and/or direction in the direction of the resultant force
In the example below, the resultant force is the difference between the two forces:
100 – 60 = 40 N (to the right)
Using moments
A see-saw will balance if the moments on each side of the pivot are equal. This is why you might have to adjust your position on a see-saw if you are a different weight from the person on the other end.
If a nut is difficult to undo with a short spanner, a longer spanner will help. This is because there will be a bigger moment on the nut, when the same force is applied further from the pivot.
Using the same principle you can increase the moment applied by a lever or a crowbar, and this can help you move heavy objects more easily.
Calculate the kinetic energy required to drive a fluid of density 4 x 10^-3 kg/m³ through a vertical pipe of height 100m maintained at a pressure of 0.02 N/m² and 0.08 N/m² at each end respectively.
Bernoulli's equation allows to find the result for the change of the kinetic energy of the fluid in the pipe is:
Kinetic energy change is: ΔK = 3.98 J
Fluid mechanics studies the movement of liquid and gases through pipes, for this it uses the Bernoulli's equation, which is the work and energy relationship for fluids.
P₂ + ½ ρ v₂² + ρ g y₂ = P₁ + ½ ρ v₁² + ρ g y₁
Where the subscripts 1 and 2 are the two points of interest, P is the pressure, ρ the density, v the velocity and y the height.
The expression of kinetic energy in fluids is:
K = ½ ρ v²
Let's substitute
K₂ - K₁ = P₁-P₂ + ρ g (y₁-y₂)
ΔK = P₁-P₂ + rho g (y₁-y₂)
Indicates the density of the fluid is 4 10⁻³ km / m³, there is a height difference of Δy = 100 m and the pressure of 0.08 Pa and 0.02 Pa.
ΔK = (0.08 -0.02) + 4 10⁻³ 9.8 100
ΔK = 0.06 + 3.92 ΔK = 3.98 J
In conclusion using Bernoulli's equation we can find the result for the change in the kinetic energy of the fluid in the pipe is:
ΔK = 3.98 J
Learn more here: brainly.com/question/9506577
Please do ( Test your understanding)
Answer:
Just convert the answers down, plug in the numbers and move the decimal to where it needs to be equal to.
Answer:
I have already given answer
Explanation:
see in upper comment there is my answer :)
I'm doing a science fair It is are fingerprints inherited. I need the independent variable and dependent variable and the control plz help
Answer:
The Independent Variable is the recorded fingerprint pattern.
The Dependent Variable is the shape of the fingerprint pattern.
The Control Group does not receive the Variable that you are testing
Explanation:
Hiệu điện thế U=10 V được đặc vào giữ hai đầu một điện trở có giá trị R=25 Q cường độ dòng điện trở bằng bao nhiêu
Answer:
Hiệu điện thế U=10 V được đặc vào giữ hai đầu một điện trở có giá trị R=25 Q cường độ dòng điện trở bằng bao nhiêu
what happens to the image when u make the hole bigger in a pinhole camera?
Answer:
more light enters and disturbs the formation of the image.
A wave with a wavelength of 2m has a frequency of 10Hz. What is its speed?
Answer:
Below
Explanation:
To find the wave speed of a wave you can use this formula :
wavespeed (v) = (frequency) x (wavelength λ)
Plug in our values :
v = (10Hz) x (2m)
v = 20 m/s
Hope this helps!
Now, seriously !
There's a stream of objects flowing past you.
Ten of them pass you every second.
Each one is 2m long.
Don't you think you can figure out how fast they're flowing ?
someone help me with this physics question!!
Full Answer in Image
a.) Ans; If an object is projected upwards in a perfectly vertical direction, then it will slow down as it rises upward. The instant at which it reaches the peak of its trajectory, its velocity is 0 m/s
Is CO2 a metal or nonmetal
non metal
co2 is a compound made up of carbon and oxygen which are both non metals, so co2 is a nonmetal. :)
Answer:
non-metal
Carbon dioxide, CO 2 - colourless gas with no odour